Electric-arc lamp.



No. 841,820. ,PATENTED JAN. 22, 1907. B, L. SCOTT.

ELECTRIC ARC LAMP.

APPLICATION FILED SEPT. 6,1905.

jz' i. I Z 9- lllllll 2 I I I T n if l J7 f 2a w 1 y i w 11 30 11 -31 J 1 J2 J2 1 a I 1 J Inventor I y I Attorneys UNITED sTArns OFFICE.

ELECTRIC- N 0. 841,820. Specification of ARC LAMP.

Letters Patent. Patented Jan. 22, 1907.

Application filed September 6, 1905. Serial No. 277,188.

To all whom it may concern.-

Be it known that I, BRAXTON L. Soon, a citizen of the United States, residing at Washington, District of Columbia, have invented a new and useful Electric-Arc Lamp, of which the following is a specification.

This invention relates to electric-arc lamps, and has for its principal object to provide a lamp of simple and economical construction and to so arrange all of the parts that repairs may be quickly made and all of the working portions of the lamp made readily accessible.

A further object of the invention is to provide a sim le form of resistance-coil and support whic may be readily placed in or removed from position andthe length of which may be quickly adjusted in accordance with the resistance required. 7 i

A still further object of the invention is to provide a carbon-clutch of simple construction and to provide readily-accessible connections whereby theclutch and its carrier may be arranged in the lamp-circuit.

With these and other objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of. construction and arrangement of parts hereinafter fully described, illustrated in the ac-', companying drawings, and particularly pointed out in the appended claims, it being understood that various changes inthe form, proportions, size, and minor details of the structure may be made without departin from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is an elevation, partly in section, of an arclamp constructed in accordance with the invention. Fig. 2 is an elevation looking from the left of Fig. 1, the casing or housing being shown in section. Fig. 3 is a detail view of a portion of the mechanism shown in Fig. 1, the parts being drawn on an enlarged scale. Fig. 4 is a detail perspective view of the upper-carbon clip or sleeve detached.

Similar numerals of reference are employed to indicate correspondin parts throughout. the several figures of the rawings.

The general frame of the lamp comprises an upper disk 10 and lower disk 11, that are formed of wood or'zothernon-conducting ma terial and are connected by a pair of approxi-.

mately vertical bars 12, both of which are formed of brass or other suitable conducting material, the lower ends of the bars convergeach other to form a support for a lower sleeve 13. The opposite sides of the disk 11 are rovided with notches for the reception of t e bars 11 and 12, and the latter are locked in place by screws 1 1, passing through openings in the bars and screwing into the material of which the disk is formed. The upper ends of the bars are riveted or otherwise secured to clips 12, each in the form of a right-angled bar having one arm secured to a rod and the other end secured to'the up or disk 10. The sleeve 13 is provided with a clamping member 14 for the support of the lower carbon, and, further, carries a globesupport 15, that is arranged for the reception of a globe 16 of the usual construction.

Secured to and depending from the upper disk 10 is a pair of spaced plates 17, formed of suitable non-conductor, these plates being preferably connected by a cross-bar 18, having threaded ends and arranged for the reception of nuts '19, which are concealed in recesses formed in the outer portions of the plates. The plates 17 serve to support a steadying resistance in the form of a coil 20, formed of any suitable material, and one end of the coil is connected by a binding-post 21 to the leadingin w're 22, while the opposite end is connected to the, windings of the clutch-actuating magnets 23. The coil is wound around the .plates, and the several turns of the coil are spaced from each other, as shown in Fi s. 1 and 2, so that there is no danger of sh -circuit'mg, while all portions .of the coil are freely exposedto the air to permit dissipaticn of the heat. The coil is stretched around the plates, so that the various turns of the coil will be held in proper position, and the coil-sections may be cut of any desired length in accordance with the resistance required.

Extending between the two bars 12 is a cross-bar 26, formed of fiber or other insulating material, and through the center of the bar and the central portion of the lower disk 11 are formed openings for the reception of a guiding-tube 27 for the upper carbon. The bar 26 serves, further, as a support for a pair of electromagnets 23, which areconnected in series with the coil in-themain circuit, and beneath the lower pole i-ece 30 of the 'elec-tromagnets are arranged armatures in "the form of disks 30, that are secured to the upper ends of clutch-operating rods 31, these ing slightly and being bent inward toward rods being guided through suitable openings formedin the disk v At a point below the disk 11 is arranged a metallic cross-bar 32, that is provided with a central opening for the passage of the up per carbon, and is further provided with openings for the passage of a pair of guide-rods 33, the upper ends of which are rigidly secured to disk 11, while the lower ends of said rods are provided with nuts or stops 34 for limiting the downward movement of said bar 32. Rigidly secured to and depending from the cross-bar 32 IS a pair of bars 35,to the lower ends of which are pivoted carbon-clutch levers 36. These levers are pivoted at a Ontop this general type.

point intermediate of their ends, and to the outer end of each is connected one of the rods 31. y The inner end of each lever is provided with a curved clutch-face 37, arranged to engage with the carbon. The. upper end of one of the,bars-35 is provided with a binding-post, to which is connected a current-conducting wire the lower end of 38, the opposite end of which is connected by a binding-post 39 to the winding of the electromagnet 23. On the top of the upper carbon is placed a split sleeve 24, which engages against the top of bar 32, as shown in Fig. 3, and revents the upper carbon falling, into the globe when too short for further use. of the globe 16 is placed a cap- 25, having a central opening for the passage of the upper carbon, the cap being of the con-- struction ordinarily employed in lamps of The resistance-coil. and the electroniagnets are protected by a suitable casing 40, extending between the two disks 10 and 11 and secured thereto any suitable manner, the casing being preferably enters through leading-in wire 22 to bindingwith each other, an

. bars 35 will be raised and be carried upward. The upper carbon is provided with ventilating-openings to permit the free passage of air, so that the parts may be kept cool.

In the operation of the lamp the current post 21 and passing through resistance-coil 2-0 and electromagnets 23 leads through wire 38 to the binding-post at the up er end of the rod 35. Before turning on t e current the carbons are su posed to be in contact as soon as the circuit is established through the clutch members and the bar 32 to the upper carbon and from thence through the lower carbon and frame to the u er binding-post 42 the electromag-" nets Wil e energized and the armatures 30 will be attracted. This, immediately throws the clutches 37 into engagement with the carbon, and as the upwar movement or the armature continues the rods 31 .are raised, and in carrying the clutch-levers 36 upward the bar 32 will also raised the proper distancetofstrike the arc, and the lampcontinues in action .until the length of the arc is such as to temporarily break the circuit, whereupon the electromagnets 23 are denergized and the armatures 30 are allowed'to fall, the upper carbon descending until it again engages with the lamp-carbon and the circuit is reestablished, the electromagnets being again energized and attracting the armatures for the purpose of again striking the arc.

One of the principal advantages of the construction described is that all of the parts of the lamp are readily accessible and in case of burning out or accidental damage any one of the parts may be quickly replaced with the lamp m situ, there being no delicate machinery which would require the removal of the lamp to the station for repairs.

Having thus described the invention, is claimed is- 1 1. In 'an arc-lamp, a frame including upper and low er disks, the lower disk being provided with a pair of diametrically opposed notches, a pair of side bars extending t rough said notches and secured to the disk, the upper ends of said bars being secured to the upper disk, the lower ends of said bars converging and forming a support'for the lower carbon and globe, a casing connecting the upper and lower disks, an insulating cross-bar arranged at a point between the upper and lower disks and connected to and supported by the side bars, a steadying resistance arranged in the space between the cross-bar and the u per disk, a pair of series magnets supporte by and depending from the crosswhat bar, and a carbon-clutch under the control of said magnets.

2. In an arc-lamp, the combination with electromagnets, of a'pair ofrigid bars or rods provided with stops at their lower'ends, a cross-bar having openings for the passa e of said bars or rods and also provided wit \an opemng for the passage of the upper carbon, hanger-rods dependin from t e cross-bar. and disposed in ara lel relation, carbonclutch members pivoted to the lianger-rods vertically guided arm'aturecarryin rods, the lower ends of which extend throug openings formed in the cross-bar and in the clutching members, and electromagnets adjacent to the armature.

In testimony that I claim the foregoing as my own I have hereto aflixed my signature in the presence of two witnesses.

BRAKTON L. SCOTT.

Witnesses:

. JAS. BRAY WINGATE, JAMES W. BURDINE. 

